ACTIFLO Process For Drinking Water Treatment

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Piers Flowers
7 years ago
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1 ACTIFLO Process For Drinking Water Treatment

2 ACTIFLO Microsand Ballasted Clarification Process Unparalleled Experience in Flocculation/Settling Since its introduction in 1989, ACTIFLO has been on the forefront of drinking water clarification. With over 770 installations worldwide, the ACTIFLO process can be found efficiently treating low turbidity mountain runoff, reservoirs with algae, warm/cold water sources with high levels of organic carbon, hard water, soft water, ground water, spring water, flashy rivers and streams, brackish water and sea water. The ACTIFLO Process with Turbomix for Drinking Water Treatment ACTIFLO is the compact clarification system that sets the bar for high rate clarifiers. The combination of 20 years of design experience and advanced flocculation results in an ACTIFLO process train with 8 minutes of hydraulic retention time and a clarifier loading rate greater than 30 gpm/ft. Typical ACTIFLO Performance Parameter Turbidity, NTU Total Organic Carbon, mg/l Raw Water treats upwards of 2,000 NTU 3-25 Settled Water 2-3 NTU* 2-3 ACTIFLO Carb 1-2 Color, PCU Algae, counts/ml 1,000-3, % removal Iron, mg/l Filtered Water <0.05 Manganese, mg/l Filtered Water <0.04 *depending on raw water quality To Sludge Treatment Hydrocyclone Recirculation Ring-shaped perforated pipe for polymer injection Downflow axial flow impeller Anti-vortex and anti-bypass baffles Clarified Effluent Raw Water Headloss reducing Coagulation Tank Flocculation Tank, equipped with a Turbomix Vertical draft-tube used as flow guide ACTIFLO process consists of: Coagulation tank with mixing to promote chemical floc formation Maturation tank with Turbomix mixing that combines floc with recirculated microsand and polymer to form a dense ballasted floc Lamella settling tank to capture residual solids and collect settled material Sand recirculation pumps withdraw the settled material and convey this material to the hydrocyclones The hydrocyclones separate the sludge from the microsand and return the clean microsand to the process with the sludge being discharged to waste or to the HCS system Concrete single train capacities of 3 to 35 MGD, package plant single train capacities of 0.2 to 7.0 MGD

3 Advancements to Reduce the Volume of Sludge Produced To reduce the volume of sludge produced by any ACTIFLO process train (existing or new) a hydrocyclone concentration system (HCS) can be installed or retrofitted. The HCS system is a simple sludge recirculation loop, which reduces sludge production by 50 80%. Goose Neck Sludge Splitter Service Water MA Hydrocyclone Overflow Sludge Blowdown 90% Tangential Feed Thickened Sludge Discharge External Sludge Recirculation Service Water (10% of feed) Underflow Microsand Recovery (20%) The HCS System The ballasted material in the settling tank is pumped to the MA Hydrocyclone and the overflow of the Hydrocyclone is sent into the recirculation loop The hydrocyclone overflow enters the repartition device and a portion of it is maintained within the recirculation loop and a portion is discharged to waste The portion being recirculated does not re-enter the ACTIFLO settling tank, it stays within the sand recirculation circuit The control of the proportions of recirculated flow versus discharged flow is maintained by a flow meter and/or a TSS probe and a modulating valve The MA hydrocyclone is specifically designed for the HCS system and incorporates a small amount of flush water to enhance the sludge recovery rate Recommended chemicals for ACTIFLO HYDREX 3,000 Series Drinking water production 4,000 Series Effective membrane antiscalants and cleaners approved by major membrane manufacturers 6,000 Series State-of-the-art clarification and wastewater chemistry and application experience

4 ACTIFLO CARB Keeping Pace with Today s Regulatory Demands To enhance the removal of Natural Organic Matter (NOM), Endocrine Disruptors and Pesticides the ACTIFLO Carb process combines the benefits of ballasted clarification with the adsorption capacities of powdered activated carbon (PAC). 7 PAC Recirculation 6 Used PAC Discharge Microsand Ballasted PAC Flocs to Hydrocyclone "MA" HYDROCYCLONE 3 Service Water Coagulant Microsand Polymer Baffle Clarified Water 1 Fresh PAC Addition 4 5 Raw Water PAC PRE-CONTACT TANK 2 COAGULATION TANK FLOCCULATION TANK WITH TURBOMIX TM SETTLING TANK WITH LAMELLA AND SCRAPER Step 1 Step 2 Step 3 Step 4 Fresh PAC addition 5-10 minute contact time with fresh and recirculated PAC Coagulant addition and floc formation Polymer and microsand addition with Turbomix mixing Step 5 Step 6 Step 7 Rapid settling and material recirculation Separation of sand from sludge and PAC with MA hydrocylcone PAC recirculation Comparative Footprints and Rise Rates Key Features and Benefits Recirculation of PAC = minimizes PAC dose Maximizes use of PAC adsorption sites Reduces sludge volume and increases sludge solids content TOC removal rates improved up to 50% versus clarification alone Flat -bottom Clarifier Sludge Blanket Clarifier DAF or Lamella Clarifier ACTIFLO gpm/sf 2 gpm/sf 4-6 gpm/sf > 30 gpm/sf

5 Worldwide References The ACTIFLO process is currently in operation worldwide in small communities and large metropolitan areas, as well as in various installations for the treatment of industrial process water and effluents. Lucien Grand, France Municipal Drinking Water Treatment Plant City of Tampa, FL David L. Tippin Water Treatment Facility 17 MGD facility with ACTIFLO followed by ACTIFLO CARB plus Ultrafiltration for organics and pesticides removal 40 MGD ACTIFLO plant with intermediate ozonation treating high influent organic levels (> 20 mg/l TOC) Little Falls, NJ Passaic Valley Water Commission Treatment Plant Somersworth, NH City of Somersworth Drinking Water Treatment Plant Albuquerque, NM Albuquerque Bernalillo County Water Utility Authority (ABCWUA) 110 MGD drinking water treatment upgrade completed within the limited space available at the existing plant 6 MGD facility that treats high TOC and high turbidity to improve disinfection by-products levels 92 MGD drinking water facility that is the cornerstone of the San Juan-Chama Drinking Water Project for ABCWUA

6 Kruger Inc. Phone Fax Kruger Marketing 13-1

ACTIFLO Process For Wet Weather and Wastewater Treatment

ACTIFLO Process For Wet Weather and Wastewater Treatment ACTIFLO Microsand Ballasted Clarification Process ACTIFLO is a high rate, compact process developed by Veolia Solutions & Technologies. The process